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//! This example shows how to use USB (Universal Serial Bus) in the RP2040 chip.
//!
//! This creates a USB MIDI device that echoes MIDI messages back to the host.
#![no_std]
#![no_main]
use defmt::{info, panic};
use embassy_executor::Spawner;
use embassy_futures::join::join;
use embassy_rp::bind_interrupts;
use embassy_rp::peripherals::USB;
use embassy_rp::usb::{Driver, Instance, InterruptHandler};
use embassy_usb::class::midi::MidiClass;
use embassy_usb::driver::EndpointError;
use embassy_usb::{Builder, Config};
use {defmt_rtt as _, panic_probe as _};
bind_interrupts!(struct Irqs {
USBCTRL_IRQ => InterruptHandler<USB>;
});
#[embassy_executor::main]
async fn main(_spawner: Spawner) {
info!("Hello world!");
let p = embassy_rp::init(Default::default());
// Create the driver, from the HAL.
let driver = Driver::new(p.USB, Irqs);
// Create embassy-usb Config
let mut config = Config::new(0xc0de, 0xcafe);
config.manufacturer = Some("Embassy");
config.product = Some("USB-MIDI example");
config.serial_number = Some("12345678");
config.max_power = 100;
config.max_packet_size_0 = 64;
// Create embassy-usb DeviceBuilder using the driver and config.
// It needs some buffers for building the descriptors.
let mut config_descriptor = [0; 256];
let mut bos_descriptor = [0; 256];
let mut control_buf = [0; 64];
let mut builder = Builder::new(
driver,
config,
&mut config_descriptor,
&mut bos_descriptor,
&mut [], // no msos descriptors
&mut control_buf,
);
// Create classes on the builder.
let mut class = MidiClass::new(&mut builder, 1, 1, 64);
// The `MidiClass` can be split into `Sender` and `Receiver`, to be used in separate tasks.
// let (sender, receiver) = class.split();
// Build the builder.
let mut usb = builder.build();
// Run the USB device.
let usb_fut = usb.run();
// Use the Midi class!
let midi_fut = async {
loop {
class.wait_connection().await;
info!("Connected");
let _ = midi_echo(&mut class).await;
info!("Disconnected");
}
};
// Run everything concurrently.
// If we had made everything `'static` above instead, we could do this using separate tasks instead.
join(usb_fut, midi_fut).await;
}
struct Disconnected {}
impl From<EndpointError> for Disconnected {
fn from(val: EndpointError) -> Self {
match val {
EndpointError::BufferOverflow => panic!("Buffer overflow"),
EndpointError::Disabled => Disconnected {},
}
}
}
async fn midi_echo<'d, T: Instance + 'd>(class: &mut MidiClass<'d, Driver<'d, T>>) -> Result<(), Disconnected> {
let mut buf = [0; 64];
loop {
let n = class.read_packet(&mut buf).await?;
let data = &buf[..n];
info!("data: {:x}", data);
class.write_packet(data).await?;
}
}
|
